/Engine/Source/Runtime/Slate/Public/Widgets/SViewport.h
virtual [TOptional](API\Runtime\Core\IO\TOptional)< [FVirtualPointerPosition](API\Runtime\SlateCore\Input\FVirtualPointerPosition) > TranslateMouseCoordinateForCustomHitTestChild ( const [SWidget](API\Runtime\SlateCore\Widgets\SWidget) & ChildWidget, const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) & MyGeometry, const FVector2D ScreenSpaceMouseCoordinate, const FVector2D LastScreenSpaceMouseCoordinate ) const